<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>set1.html</title>
</head>
<body>
    <p>1</p>
    <p>2</p>
    <p>3</p>
    <script>
        var [p1,p2,p3]=document.querySelectorAll('p');
        var x=new Set([p1,p2,p3]);
        x.forEach(function(elme){
            elme.style.color='red'
            elme.style.backgroundColor='yellow'
        })

    </script>
</body>
</html>